Several of their behaviours strike scientists as peculiar. One such behaviour is the habit of sleeping topi to rest their mouths on the ground with their horns sticking straight up into the air. Male topi has also been observed standing in parallel ranks with their eyes closed, bobbing their heads back and forth.
Sources:
(*) https://en.wikipedia.org/wiki/Damaliscus_lunatus
(*) https://www.inaturalist.org/taxa/42276-Damaliscus-lunatus